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/*
 * @test
 * @bug 4936763
 * @summary Verify that DHKeyAgreement can generate secret key
 * objects for AES algorithm
 * @author Valerie Peng
 * @run main/othervm -Djdk.crypto.KeyAgreement.legacyKDF=true DHGenSecretKey
 */
import java.security.*;
import java.security.interfaces.*;
import javax.crypto.*;

public class DHGenSecretKey {

    public static void main(String[] args) throws Exception {
        DHGenSecretKey test = new DHGenSecretKey();
        test.run();
    }

    public void run() throws Exception {
        // generate keyPairs using parameters
        KeyPairGenerator keyGen =
            KeyPairGenerator.getInstance("DH", "SunJCE");

        // Alice generates her key pairs
        KeyPair keyA = keyGen.generateKeyPair();

        // Bob generates his key pairs
        KeyPair keyB = keyGen.generateKeyPair();

        KeyAgreement bobAlice = KeyAgreement.getInstance("DH", "SunJCE");
        bobAlice.init(keyB.getPrivate());
        bobAlice.doPhase(keyA.getPublic(), true);
        byte[] keyMaterial = bobAlice.generateSecret();

        bobAlice.doPhase(keyA.getPublic(), true);
        SecretKey skey = bobAlice.generateSecret("AES");
        byte[] keyVal = skey.getEncoded();

        System.out.println("Generated " + keyVal.length*8 +
            "-bit AES key");
        for (int i = 0; i < keyVal.length; i++) {
            if (keyVal[i] != keyMaterial[i]) {
                throw new Exception("Error: key value comparison failed!");
            }
        }
        System.out.println("Test Passed");
    }
}
